Vienna’s most alluring nightcaps await at the tiny Loos American Bar, minutes from St. Stephen’s Cathedral. Bartenders turn out exquisite classic cocktails that are amplified by a splendid circa-1908 backdrop of brass, onyx, mahogany, and mirrored walls orchestrated by architect Adolf Loos.

"When your Mahler started to fill (but that is the wrong word — because it was more this sensitive trembling) the Cathedral today — I thought it the most beautiful music I had ever heard. I am so glad I didn’t know it — it was this strange music of all the gods who were crying."